Well as any television network executive will tell you, for every complaint letter or email they get, there are likely a thousand people who feel the same but don't bother to comment. That's why it must be considered sample data, and only a little over a week's worth at that. That makes it even more remarkable since it reflects the latest bug fix release, and things should be getting better. I recently called Apple Support for a problem I was having with Yosemite on my 27" Cinema Display, and the hold time was 20 minutes when it's usually just a couple. Apple Support was excellent as usual once I got someone, but the long wait time tells me something is keeping them very busy these days. People don't call for support when all is well.
Now don't get me wrong - I'm a huge Apple fan and have been for many years. I've bought into the entire ecosystem with 5 Macs, 3 iPhones, 3 iPads, 3 Apple TV's, etc. I care passionately what happens with Apple and I'm looking forward to a long continued relationship with them and a bright future. But I have to honestly say that I have been concerned with the User Interface direction they have taken with iOS and now OSX over the past two years. I'm a business owner and can easily spend 12 hours a day in front of my Mac display getting real work done - not just watching videos, checking FaceBook, or playing games. I have perfect vision, but I'm getting severe eye strain from Yosemite. That's not just about disliking how it looks - it's a functional usability issue. Add to that the lack of quality control in this release (as evidenced by the widely reported wi-fi issues), and I'm genuinely and sincerely concerned about what is going on. Yes I freely admit that I'm nostalgic for how beautiful (and internally efficient) Snow Leopard was with it's colored application sidebar icons and "lickable" traffic light icons, but I could also use it and every release of OSX up to Mavericks for hours on end without eye fatigue.
And make no mistake, even with the misgivings I have over the directions taken in iOS and OSX of late, Apple is still by far better than any of the alternatives, and I will stand by them as they work their way through these growing pains, and hopefully listen to their loyal users as we express our sincere heart-felt concerns.